I have fixd a few stocks that have developed cracks, both rifle and shotgun.
My latest fix was done on an XT stock that developed a crack at the bottom of the top tang.
I removed the receiver from the stock and using a flexable shaft on my drill I drilled a 5/64th hole parallel to the crack about 1/16"-3/32" below the surface and as long as the crack. I then wrapped the stock with rubber tubing to draw the crack as tight as I could get it. The 5/64 hole is slightly larger than a hardwood toothpic which I cut off the tapered point. Coating the toothpic with a good woodglue or Accruglass I filled the hole and let it dry.
This method will interrupt the split in the woods fiber and bond the wood with a 360 degree glue joint. As most woodworkers know a proper glue joint will be stronger than the wood.
I've had good success with this method and am just passing along this info.
Take it for what's it's worth.

jbmi- Your method will work. I would add that it is important to find out why the stock cracked. The crack you described sounds like one due to an inletting problem. I would fix the problem first and then repair the crack.

Pat, you're correct and I forgot to mention that step, thinking most would realize the original problem. I took my Dremel tool with a small sanding drum to finish off the repair then continued to relieve the area where I noticed the binding every so slightly till it showed the same uniform gap around the tang. Final step was to apply a couple of light coats of polyurethane to seal the exposed raw wood.

Drilling a small hole in the end of the wood at the crack and injecting the epoxy with an appropriate size syringe until it fills the crack makes for a very strong repair. Clamp lightly with a padded clamp or wrap with surgical tubing to hold it in place until the epoxy sets.